Question

In a PN-junction(a) P and N both are at same potential(b) High potential at N side and low potential at P side(c) High potential at P side and low potential at N side(d) Low potential at N side and zero potential at P side

Answer 1

Because the potential difference always flow from a higher potential to a lower potential and while the electrons are always assumed to be a negatively charged bodies, makes the current to flow from the negative side to the positive side of the PN junction.